Researchers say mysterious, seconds-long GPS interference bursts detected across Europe appear to come from Russian EKS early-warning satellites, making this "a rare example of human-made GPS interference coming from space," reports Ars Technica. The signals may be tests of space-based jamming capability, short satellite communications, or something else, but experts say they raise troubling questions about whether GPS disruption could eventually be weaponized on a continental scale. From the report: The discovery came from an investigation detailed in a June 2 preprint paper by Todd Humphreys and his student Zach Clements at The University of Texas at Austin, along with Argyris Krizise at Stanford University in California. By sifting through public data from ground-based stations with global navigation satellite system (GNSS) receivers, they identified a pattern of high-powered interference lasting less than 10 seconds each time but simultaneously detectable by ground stations across Europe from Norway to Spain to Poland, and even reaching as far west as Greenland and Canada. By analyzing the ground station data from January 2019 to April 2026, the researchers found 75 days with at least one widespread GNSS interference event overlapping with the GPS L1 frequency band centered on 1575.42 megahertz. That represents the main band used for signal transmission by the US-made GPS satellite constellation and GNSS constellations from other countries. Such interference patterns happened mostly on Tuesdays, Wednesdays, and Thursdays during business hours in Europe, Humphreys told the YouTube channel Veritasium. Because such "continental-scale" interference was simultaneously affecting GPS receivers across Europe and beyond, Humphreys and his colleagues calculated that the source had to be at least 1,200 kilometers above the Earth. [...] In the Veritasium video, Humphreys speculated that the Russians may have been testing the satellites' GPS interference capabilities only briefly on a neighboring frequency adjacent to the typical GPS band. "And then in the eventual future when there is a hot conflict, they go ahead and tune their transmitter down to the GPS band, but it's much more damaging now that it lies right on that band," he said. Incidentally, the raw data also revealed a second interference burst from the Russian satellites in a lower-frequency band used by China's BeiDou navigation system. "I can no longer say this is accidental with confidence," Humphreys told Veritasium. He also described the Russian satellites' quiet demonstration as a "massive escalation in the electronic warfare background conflict that is going on right now." Richard Bowden, division head of assured and resilient PNT at the multinational technology company GMV in Spain, wrote in a LinkedIn comment: "These signals are, without a doubt, intentional and placed on or around GNSS signals, and have the potential to disrupt legitimate use of GNSS services. But from our side at least, we can't be sure they are intentionally malicious or intended as an EW [electronic warfare] weapon."

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